SDRAM from 16M to 32M
1>修改Flash Utility 的配置文件 cp_12.inc
....
rem - ++++++++++++++++++++++++++++++++++++++++++++++++++
rem - SDRAM Control Register (SDCONF0/SDCONF1):
rem -
rem - SDCONF[31:19] - based address
rem - base address = (value) << 18
rem -
rem - SDCONF[18:16] - reserved
rem -
rem - SDCONF[15] - SDRAM Mode Set Command Register
rem -
rem - SDCONF[14] - reserved
rem -
rem - SDCONF[13] - auto-precharge mode
rem - 0 - auto-precharge
rem - 1 - no auto-precharge
rem -
rem - SDCONF[12:11] - latency
rem - 00 - 1 MCLK
rem - 01 - 2 MCLK
rem - 10 - 3 MCLK
rem - 11 - reserved
rem -
rem - SDCONF[10:8] - reserved
rem -
rem - SDCONF[7] - number of banks
rem - 0 - 2 banks
rem - 1 - 4 banks
rem -
rem - SDCONF[6:5] - width of data bus
rem - 00 - bank disable
rem - 01 - 8-bit
rem - 10 - 16-bit
rem - 11 - 32-bit
rem -
rem - SDCONF[4:3] - number of column address bit
rem - 00 - 8-bit
rem - 01 - 9-bit
rem - 10 - 10-bit
rem - 11 - reserved
rem -
rem - SDCONF[2:0] - size of SDRAM
rem - 000 - bank disabled
rem - 001~110 - (2^value)Mbytes
rem - 111 - reserved
rem -
rem - current setting:
rem - base address -
rem - SDRAM0: 0x00000000 ~ 0x007FFFFF
rem - SDRAM1: 0x00800000 ~ 0x00FFFFFF
rem - Set mode command, auto-precharge enable,
rem - CAS latency = 3, 4 banks, 32-bit data bus,
rem - column address = 8-bit, 8M bytes
rem - ++++++++++++++++++++++++++++++++++++++++++++++++++
rem - setmem 0xFFF01008 0x00009041 32 // Zy
rem - setmem 0xFFF0100C 0x00000000 32 // Zy
LONG 0xFFF01008 0x000090E3 // to: LONG 0xFFF01008 0x000090E4
LONG 0xFFF0100C 0x010090E3 // to: LONG 0xFFF0100C 0x020090E4
....
2>redboot:
修改下面文件packages/hal/arm/w90n740/current/include/hal_platform_setup.h
0x000090E3 ---> 0x000090E4
0x010090E3 ---> 0x020090E4
修改下面文件packages/hal/arm/w90n740/current/include/pkgconf/
CYGMEM_REGION_ram_SIZE and CYGMEM_SECTION_heap1_SIZE
3>kernel:
sdram 大小的修改include/linux/autoconf.h 或
make menuconfig -->System Type-->SDRAM Size
4>运行后发现问题:
Unhandled fault: alignment exception (13) at 0x00000001
fault-common.c(97): start_code=0x1f80040, start_stack=0x1ffff58)
Internal error: Oops: 0
CPU: 0
pc : [<000d7bf8>] lr : [<00049ab8>] Not tainted
sp : 0063bf5c ip : ff000067 fp : 0063bf7c
r10: 01ffff99 r9 : 00000015 r8 : 0063bf8c
r7 : 00000000 r6 : 00609000 r5 : 01ffff99 r4 : ff000067
r3 : 00000003 r2 : 00000000 r1 : 01000f95 r0 : ff609067
Flags: nzCv IRQs on FIQs on Mode SVC_32 Segment kernel
Control: 0
Process mount (pid: 12, stackpage=0063b000)
Stack:
0063bf40: 00049ab8 000d7bf8 20000013 ffffffff 001e7008
0063bf60: 001e3020 001e2008 c0ed0000 00014720 0063bfac 0063bf80 0004a05c 00049a48
0063bf80: 0060a008 0060a008 00001002 00000000 001e7008 00000000 001e2008 0063a000
0063bfa0: 00000000 0063bfb0 00014580 0004a044 001e7008 00019c84 001e2008 001e3020
0063bfc0: 01ffff99 c0ed0000 001e7008 00000000 001e2008 001e2008 001e3020 001e7008
0063bfe0: 01ffff99 01fffcbc 01fffcc0 01fffcac 01f8ac2c 01fb913c 60000010 001e2008
Backtrace:
Function entered at [<00049a38>] from [<0004a05c>]
r8 = 00014720 r7 = C0ED0000 r6 = 001E2008 r5 = 001E3020
r4 = 001E7008
Function entered at [<0004a034>] from [<00014580>]
r7 = 0063A000 r6 = 001E2008 r5 = 00000000 r4 = 001E7008
Code: b4c02001 d4c02001 (e4c02001) e0811003 e3a02000
Memory fault
对照System.map
00049a38 t copy_mount_options
0004a034 T sys_mount
修改fs/namespace.c-->copy_mount_options()
0x1000000 ---> 0x2000000